Electric-arc lamp



No.'62|,855. Patented Mar. 28, I899. B. SCHEFBAUER.

ELECTRIC ARC LAMP.

(Application filed Mar. 11, was. (No Model.) 2 Sheets-Sheet l.

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No. 62!,855. Patented Mar. 28, I899. n. SCHEFBAUER.

ELECTRIC ARC. LAMP.

(Application filed In. 11, 1898.) (No Model.) 2 SheetsSheet 2.

I NVE 9R WW 7 UNITED STATES PATENT OFFICE.

RUPERT SOIIEFBAUER, OF JERSEY CITY, NEW JERSEY, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE STERLING ARC LAMP COMPANY, OF

NEXV YORK.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 621,855, dated March 28, 1899.

Application filed March 11, 1898. derial No. 678,475. (No model.) i

To all whom it may concern:

Be it known that I, RUPERT SOI-IEFBAUER,

a citizen of the United States, and a resident of Jersey City, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Electric-Arc Lamps, of which the following is a specification.

This inventionrelates to improvements in electric-arc lamps; and the object of my invention is to provide anew and improved lamp of this kind which is simple in construction, adjusts and controls the carbons perfectly, and prevents flickering.

In the accompanying drawings, forming a part of this specification and in which like letters of reference indicate like parts in all the views, Figure 1 is a vertical sectional view through my improved lamp. Fig. 2 is through the packing for the lower carbon.

Fig. 7 is a detail end View of the carbon-regulating mechanism.

A sprocket-chain A passes over asprocketwheel B, made integral with the pulley O, having the circumferential groove 0, and from one end of said chain the cross-piece A is suspended, which has forked ends which embrace the uprights B of the lamp-frame and whereby said cross-piece is guided perfectly in its up and down movements. By means of the clamp 13 the upper carbon D is attached to the crosspiece A. A counterbalancingweight E is attached to the other end of the chain A and is guided in one of the uprights 13, which is hollow.

The combined pulley and spr0cket-wheel B O is mounted loosely on a shaft F on standards G on a plate H of the lamp-frame, and

on said shaft F a rocking frame .l is loosely mounted. An arm K is hinged to one end of through which the positive current passes be fore passing to the upper carbon by means of the wire 0. A plunger P, working in dash-pot Q, extends upward from the outer end of the arm K; A spring R, attached to the arm K and bearing on the rocking frame J, tends to hold the arm K in line. with the frame J. A fine chain S or a cord or wire is passed several times around the pulley O and has its ends attached to the arm K at different points from the pivotal center of said arm, so that when the arm is pulled up the chain S is applied friction-tight-on the pulley O, and said pulley, with its sprocket-wheel 13, is turned to the right on the shaft F.

When the outer end of the shaft K descends, the frame J swings down with it until the end of the frame rests upon the stop W, the arm K continuing to descend, as shown in dotted lines in Fig. 1, so that the chain is now loose on the pulley O, permitting it to turn freely on its shaft. The chain S and pulley 0 thus form a friction-brake for turning the sprocket-wheel B in one direction. W is a stop for limiting the upward movement of the frame J.

When the carbons are in contact and the resistance low, the suction magnets or solenoids N draw upward their armatures M,-

and thereby the friction-brake is applied, and the pulley O and its sprocket-wheel B are turned from left to right and the chainA lifts the positive carbon D. As the resist ance in the line increases the armatures M gradually descend and the frictioirbrake is loosened, permitting the pulley O and its sprocket-wheel B to turn from right to left under the action of the weight of the positive carbon, and thus permitting said carbon to descend until the normal resistance is attained. The armatures are then pulled upward by the solenoids and the brake is again applied, holding the upper carbon in position for the time being, and so on.

A cross-piece b on the two uprights B is provided with a hole through which the upper carbon D passes and by which it is guided in its vertical movements. A socket d is formed on the upper surface of the crosspiece b,,and in the same an asbestos packing washerfis placed, which is held in place by a plate 0, held by screws f on the upper surface of the cross-piece. A neck 9 is formed on the underside of the cross-piece to receive the upper end of a downwardly-tapering globe h, the lower end of which rests on an asbestos packii'ig-washer j in a socket 70, through which bottom washer j the lower carbon D passes. The are formed between the carbon-points is thus located within the globe h. The cross-piece b is pressed downward on the upper end of the globe h by two helical springs m, surrounding the uprights B and bearing against the adjustable collars 12, applied on the said uprights, adjustable collars 0 being applied 011 the uprights to prevent the springs m from pressing the cross-piece 1) down too far when the globe h is removed.

To remove the globe, it is only necessary to raise the upper and lower carbons in case they are not sufficiently consumed and then to lift the cross-piece b, when the globe can easily be removed to be cleaned or to be replaced by another.

As the carbon is guided by the hole in the cross-piece Z), it cannot swing at its lower end sufliciently to displace the globe.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In an electric-arc lamp, the combination of a chain suspending the upper carbon, a sprocket-wheel over which said chain passes, a pulley connected with said sprocket-wheel a gripping-cord passing over said pulley,

a tilting lever and two stops between which it plays, a second lever pivoted to the first and to which both ends of said cord are connected, means for yieldingly holding the second lever in line with the first, and an electromagnet connected with the second lever and adapted to move it with respect to the first lever when the latter is detained by its stops, whereby the cord is tightened or loosened upon the pulley, substantially as described.

2. In an electric-arc lamp, the combination with the uprights of a lamp-frame, a crosspiece mounted to move up and down on the uprights, a neck on the under side of the cross-piece, a socket formed on the upper side of the cross-piece, a packing-washer in said socket through which packing-washer the upper carbon passes, springs for pressing the cross-piece downward, a socket at the bottom of the lamp-frame, a washer in said socket, a glass globe located between the uprights of the frame, and having its lower open end resting on the washer in the bottom socket, the upper end of the globe being within the neck, on the under side of the movable cross-pieee on the uprights, substantially as herein shown and described.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this 3d day of March, 1898.

RUPERT SCIIEFBAUER.

Witnesses:

OSCAR F. GUNZ, N. M. FLANNERY. 

